I’m with Doug on Cadbury’s : UK- produced Cadbury’s is fine, but it is made in other countries under franchise (not just in the US) and these “look-alikes ” are horrible, hugely disappointing, nothing like the real thing.
Yes, another vote for Fry’s Five Boys, Tiffin and Turkish Delight. Cadbury’s now do a big Tiffin bar, and I really like the one they do with bits of Daim in it.
And what about Galaxy? Smoother and slightly more waxy than Cadbury’s but very edible, including their caramel-filled bar.
Marks & Spencer do good truffles too.